fpzip is a BSD-licensed open-source library for lossless or lossy compression of large multidimensional floating-point arrays. Although written in C++, fpzip has a C interface. fpzip is based on the algorithm described in the following paper:

Peter Lindstrom and Martin Isenburg, “Fast and Efficient Compression of Floating-Point Data,” IEEE Transactions on Visualization and Computer Graphics, 12(5):1245–1250, September–October 2006, doi:10.1109/TVCG.2006.143.

fpzip was primarily designed for lossless compression but also has provision for lossy compression. For lossy compression, our zfp compressor often outperforms fpzip.

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